return {
    id = 2,
    a = {
        y1 = 1,
        y2 = 2,
        y3 = 3,
    },
    b = {
        y1 = 21,
        y2 = 221,
        y3 = 23,
    },
    c = {
        y1 = 31,
        y2 = 32,
        y3 = 33,
    },
}